The newly appointed chairman of Vorak plc has been told that considerable tension and suspicion exists between the executive and non-executive directors on the board. The executive directors question the competence of the non-executive directors and the non-executive directors believe that important information is being withheld from them. Assuming that the concerns of each group are well founded, what advice would you give to the chairman concerning how to ease the tension and promote a better working relationship between the two groups?